Determination of a capability of a user equipment

A network node for determining if a user equipment is configured to support network sharing, the network node comprising

• at least one processor
• at least one memory including computer program code
• and by executing at least portion of the computer program code with the at least one processor the network node is caused to perform:
• transmit a message to the user equipment, the message comprising information on at least two PLMN identities,
• receive a response message from the user equipment,
• determine determining if the response message from the user equipment comprises at least one information field reserved for at least one PLMN identity, and
• determine on a basis of an existence of the information field in the response message that the user equipment is configured to support network sharing and determining on basis of absence of the information field in the response message that the user equipment is not configured to support network sharing.

A system for determining if a user equipment is configured to support network sharing, the system comprising

• at least one user equipment
• a source network configured to serve the user equipment,
• a network node residing in the source network,
• at least one target network configured to serve the user equipment,
• wherein the network node within the system is configured to
• transmit a message to the user equipment, the message comprising information on at least two PLMN identities,
• receive a response message from the user equipment,
• determine if the response message from the user equipment comprises at least one information field reserved for at least one PLMN identity, and
• determine on a basis of an existence of the information field in the response message that the user equipment is configured to support network sharing and determining on basis of absence of the information field in the response message that the user equipment is not configured to support network sharing
• and
• the user equipment within the system is configured to
• transmit a response message to the network node in response to a receipt of the message with at least information field reserved for at least one PLMN identity.